#include<stdio.h>
int main()
{
    char grade;
    printf("请输入您的分数等级：");
    scanf("%c",&grade);
    printf("your score:");
    switch (grade)
    {
    case 'A':printf("85~100\n");
        break;
    case 'B':printf("70~84\n");
        break;
    case 'C':printf("60~69\n");
        break;   
    case 'D':printf("<60\n");
        break; 
    default:
        printf("enter the error date!\n");
        break;
    }
return 0;
}